It's called simple math and logic.
For this to be true, 1.7 billion people would have to be so in lock step that every aspect of their psyche is dictated by their faith. That's literally impossible. Only some Muslims even listen to the music on a regular basis, let alone respond the way you assume they do; some are liberal, some are moderate, some are conservative; and within those groups, there are always going to be people who are more jovial and social than others.
And can you actually stop and think about the provability of you're trying to claim, please? You're arguing that most (if not all) Muslims are genuinely incapable of being interesting simply because of the religion they practice. You have no evidence whatsoever, it's impossible to quantify, and it's ridiculously easy to defeat -- all I need to do is present even a handful of interesting Muslims. Like, say, Dave Chappelle.
This isn't like other arguments, where there's some "it's just your opinion, man" wiggle room. You are objectively, absolutely wrong.